I'm also working on some markers for when there are just too many zombies to fit on the board. The zombie figures will go on the board, the columns will stay off the board with the corresponding horde of zombies.

Thanks Dunkin. I was trying a different painting technique for this, using natural sponges and thinned paint that lets the color underneath show through. I was pretty happy with the results. It gave a lot of nice texture and variation without being that much more work than the traditional Hirst technique.

I used bricks tinted with cement colorant so I just used clear acrylic floor wax for the first coat.
Then I painted on a coat of thin brown black paint and wiped it off to leave just the recesses painted.
Then I sponged on a thin medium brown, followed by a thin light brown. Since the sponge puts more paint on raised areas, you get texture and highlighting at the same time. It takes a little practice to get the right amount of paint on the sponge.
I also sponged on some green and yellow paint to simulate lichen, but that didn't really come through in the final result.
Then I did a very light drybrush with light tan.
Then I applied a wash of dark green brown.
Finally, I used various colors of diluted ink to tint some of the individual stones.

The rust color of the indicator was also done with natural sponge.

The shield and back of the indicator were made of green stuff pressed into an Instant Mold impression of the first player coin from the game. I then trimmed the shield and carefully routed out a depression for it with a Dremel tool and diamond bit.

I love your painting job on this. Really. It's more or less the tone i use myself for the walls of my Mordheim city and i was lacking new ideas. I had decided to add stones with a different colour and i did not know exactly what colours to chose. You give me excellent examples... Thanks !

Posting a little more info on the dial construction in response to a question:

This picture shows the components of the dial in the order they go together. From left to right: the 2" Reaper mini base with green stuff back, the disk with printed dial face (there's another disk used as a spacer), the cover with reading window, and the handle for turning the disk.

The disk face is just printed and glued to a polystyrene card disk that fits within the base. A rivet is epoxied to the disk as a spindle. This disk was a little loose, so I added a second disk as a spacer so it would fit snugly and not turn too easily.

The cover is also made from polystyrene card with some bits added.

The handle is the bottom of a birdcage charm from the craft store clearance aisle.